The distributive property: a(b + c) = ab + ac.
Factors of 38: 1, 2, 19, 38
Factors of 57: 1, 3, 19, 57
GCF(38, 57) = 19
38 + 57 = 19 · 2 + 19 · 3 = 19(2 + 3)
